Creating French Onion Meatballs with Savory Onion Sauce is a straightforward process if you follow these easy steps:

1. Preheat Oven: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
2. Prepare Meatball Mixture: In a large bowl, combine ground beef, breadcrumbs, grated Parmesan cheese, chopped onion, minced garlic, parsley, egg, salt, pepper, thyme, and onion powder. Mix until well combined.
3. Form Meatballs: Shape the mixture into meatballs, about 1.5 inches in diameter. Place them on the prepared baking sheet.
4. Bake Meatballs: Bake in the preheated oven for 20-25 minutes or until they are browned and cooked through.
5. Cook Onion Sauce: While the meatballs are baking, heat olive oil and butter in a skillet over medium heat. Add the chopped onion and sauté until caramelized, about 15-20 minutes.
6. Add Broth: Once the onions are caramelized, pour in the beef broth and bring to a simmer. Allow it to reduce slightly for about 5-7 minutes.
7. Combine Meatballs and Sauce: Once the meatballs are done, add them to the skillet with the onion sauce. Stir gently to coat the meatballs in the sauce.
8. Add Cheese: Sprinkle the shredded Gruyère cheese over the meatballs and cover the skillet. Allow the cheese to melt for about 5 minutes.
9. Serve: Once the cheese is melted and bubbly, remove from heat and serve immediately.

These steps will guide you in creating this incredible dish effortlessly.